Broadcast Signal Transmitting Apparatus Subband Allocation
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Solution Overview
Problem
Current digital broadcast systems face challenges in efficiently transmitting high-capacity data, robustness in mobile environments, and flexibility in frequency allocation, particularly in ensuring reliable reception of mobile broadcast signals without additional frequency allocation.
Innovation Solution
The proposed solution involves a broadcast signal transmitting apparatus that uses RF signals within conventional broadcasting systems to transmit additional and mobile broadcast signals by allocating Physical Layer Pipes (PLPs) to subband units within narrow frequency domains, inserting robust pilot patterns, and employing MIMO systems to enhance channel estimation and resistance to burst fading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional broadcast signals are transmitted using conventional RF signals without additional frequency allocation, then frequency utilization efficiency is improved, but signal transmission capacity and robustness deteriorate
Solution Approach 1:
The patent segments the frequency spectrum into multiple subbands and further divides them into subcarrier groups. By allocating PLPs to specific subcarrier groups rather than using the entire frequency band, the system achieves efficient frequency utilization while maintaining transmission robustness through targeted spectral allocation. This segmentation allows conventional RF signals to carry additional broadcast content without requiring additional frequency allocation.
Solution Approach 2:
The patent introduces a hierarchical structure with multiple dimensions of organization: signal frames contain PLPs, which are allocated to subcarrier groups within subbands. This multi-dimensional allocation strategy (time-frequency-space) enables the system to transmit additional broadcast signals using conventional RF frequencies without compromising robustness, as the additional dimensionality provides flexibility in signal placement and reception.
2Use of energy by moving object
If PLPs are allocated to subband units within narrow frequency domains, then power consumption is minimized, but data transmission capacity deteriorates
Solution Approach 1:
The patent segments the frequency domain into subbands and further into subcarrier groups, allowing PLPs to be allocated to narrow frequency domains. This segmentation enables the receiver to focus computational resources on specific frequency regions, minimizing overall power consumption while the system maintains high data transmission capacity through efficient use of the allocated spectral resources.
Solution Approach 2:
The patent applies local quality by allocating PLPs to specific subcarrier groups within subbands rather than uniformly across the entire frequency spectrum. This localized allocation optimizes the balance between power consumption and transmission capacity by concentrating resources where they are most needed, allowing the receiver to process only relevant frequency portions while maintaining high overall system efficiency.
3Measurement precision
If pilot patterns are inserted to enhance channel estimation in mobile environments, then channel estimation performance is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The patent segments the frequency domain into subcarrier groups and allocates pilot signals to specific groups rather than transmitting pilots across the entire spectrum. This segmented pilot placement improves channel estimation performance for mobile environments by providing sufficient pilot density in critical regions while minimizing the overhead impact on data transmission efficiency.
Solution Approach 2:
The patent applies local quality by strategically placing pilot patterns in specific subcarrier groups where they are most needed for channel estimation, rather than uniformly distributing pilots across all frequencies. This localized pilot placement optimizes the balance between estimation accuracy and transmission efficiency by concentrating pilot resources where they provide the greatest benefit for mobile reception.
4Reliability
If preamble symbols are additionally allocated to signal frames, then robustness against burst fading is improved, but signal frame complexity increases
Solution Approach 1:
The patent segments the signal frame structure by adding preamble symbols as a distinct component before the main data transmission. This segmentation allows the preamble to specifically address burst fading issues without complicating the overall frame structure, as the preamble operates independently from the data PLPs and can be processed separately by the receiver.
Solution Approach 2:
The patent applies preliminary action by placing preamble symbols at the beginning of signal frames before data transmission. These preamble symbols perform channel estimation and synchronization functions in advance, preparing the receiver for the upcoming data transmission and enhancing robustness against burst fading without adding complexity to the main data frame structure.
Data Source
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AI summary
Disclosed are a broadcast signal transmitting apparatus, a broadcast signal receiving apparatus, and a method for transceiving a broadcast signal in a broadcast signal transceiving apparatus. A method for transmitting a broadcast signal comprises the following steps: performing MIMO encoding on a first input signal which is mapped to a first QAM type symbol and a second input signal which is mapped to a second QAM type symbol to output a first transmission signal and a second transmission signal; mapping the first transmission signal to a different subcarrier location for each cell unit while maintaining the bandwidth of a sub-band in a first signal frame constant, and mapping the second transmission signal to a different subcarrier location for each cell unit while maintaining the bandwidth of a sub-band in a second signal frame constant; inserting a pilot signal of a pilot pattern determined on the basis of FFT size information into a first signal frame to which the first transmission signal is mapped, and inserting first and second preamble signals into a starting point of the first signal frame to which the pilot signal is inserted; and inserting a pilot signal of a pilot pattern determined on the basis of FFT size information into a second signal frame to which the second transmission signal is mapped, and inserting first and second preamble signals into a starting point of the second signal frame to which the pilot signal is inserted.